Overview
11 DESCRIPTION Osimertinib is a kinase inhibitor for oral use. The molecular formula for osimertinib mesylate is C 28 H 33 N 7 O 2 •CH 4 O 3 S, and the molecular weight is 596 g/mol. The chemical name is N-(2-{2-dimethylaminoethyl-methylamino}-4-methoxy-5-{[4-(1-methylindol-3-yl)pyrimidin-2-yl]amino}phenyl)prop-2-enamide mesylate salt.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Osimertinib is a kinase inhibitor of the epidermal growth factor receptor (EGFR), which binds irreversibly to certain mutant forms of EGFR (T790M, L858R, and exon 19 deletions) at approximately 9-fold lower concentrations than wild-type. Two pharmacologically-active metabolites (AZ7550 and AZ5104 circulating at approximately 10% of the parent) with similar inhibitory profiles to osimertinib have been identified in the plasma after oral administration of osimertinib. AZ7550 showed a similar potency to osimertinib, while AZ5104 showed greater potency against exon 19 deletion and T790M mutants (approximately 8-fold) and wild-type (approximately 15-fold) EGFR.
Indications
- 1 INDICATIONS AND USAGE TAGRISSO is a kinase inhibitor indicated for: • adjuvant therapy after tumor resection in adult patients with non-small cell lung cancer (NSCLC) whose tumors have epidermal growth factor receptor (EGFR) exon 19 deletions or exon 21 L858R mutations, as detected by an FDA-approved test. ( 1.1 , 2.2 ) • the treatment of adult patients with locally advanced, unresectable (stage III) NSCLC whose disease has not progressed during or following concurrent or sequential platinum-based chemoradiation therapy and whose tumors have EGFR exon 19 deletions or exon 21 L858R...
Common Doses
- 80 mg
- 60 mL
- 120 mL
- 240 mL
Dosage
2 DOSAGE AND ADMINISTRATION Adjuvant treatment of early-stage NSCLC: 80 mg orally once daily, with or without food, until disease recurrence, or unacceptable toxicity, or for up to 3 years. ( 2.3 ) Locally advanced, unresectable (stage III) NSCLC: Following platinum-based chemoradiation therapy, 80 mg orally once daily, with or without food, until disease progression or unacceptable toxicity. ( 2.3 ) Metastatic NSCLC: 80 mg orally once daily, with or without food, until disease progression or unacceptable toxicity. ( 2.
Contraindications
- 4 CONTRAINDICATIONS None. None. ( 4 )
Side Effects
- 6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the labeling: • Interstitial Lung Disease/Pneumonitis [see Warnings and Precautions (5.1 )] • QTc Interval Prolongation [see Warnings and Precautions (5.2) ] • Cardiomyopathy [see Warnings and Precautions (5.3) ] • Keratitis [see Warnings and Precautions (5.4) ] • Erythema multiforme, Stevens-Johnson syndrome, and Toxic epidermal necrolysis [see Warnings and Precautions (5.5) ] • Cutaneous Vasculitis [see Warnings and Precautions (5.6) ] • Aplastic Anemia [see Warnings and Precautions (5.
Interactions
- 7 DRUG INTERACTIONS Strong CYP3A Inducers : Avoid concomitant use. If not possible, increase TAGRISSO to 160 mg daily in patients receiving a strong CYP3A4 inducer. ( 2.5 , 7.1 ) 7.1 Effect of Other Drugs on Osimertinib Strong CYP3A Inducers Co-administering TAGRISSO with a strong CYP3A4 inducer decreased the exposure of osimertinib compared to administering TAGRISSO alone [see Clinical Pharmacology (12.3) ] . Decreased osimertinib exposure may lead to reduced efficacy. Avoid co-administering TAGRISSO with strong CYP3A inducers.